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Right now. i am being honest. i will take a polygraph test. i have said that how many times. officer snead, i was not there. i will take a polygraph test right now to prove to you that i was not there. >> when you have someone in the interrogation room who offers to take a polygraph, that's a strong sign of innocence that should not be disregarded. >> we know you were in the house. >> snead's partner ups the ante. >> i was nowhere near the house. >> they have evidence, he says. >> we know you were in the house. we have evidence. >> they don't, by the way, have any evidence of that. though it i...

In the restaurant? >> i'm kind of back in a corner, yeah. >> he watched the student have a few drinks, and when he left, the detective snagged the dirty beer mugs and sent them out for dna testing. the results would take weeks, leaving a town full of young people on edge. >> dads and moms were telling their college age kids, be alert everywhere you go. go with people when you go out. don't be alone. and that's a frightening order to give anybody. >> frightening, but sound advice, because in this case, connecting the dots wouldn't be so easy. detectives have a second possible suspect in their...

We turn next tonight to the search of a missing wife i we turn next tonight to the search of a missing wife in the mojave desert. her husband breaking down, pleading for her return. here is will carr. >> reporter: tonight authorities are scouring one of the hottest places on earth with k-9s after 69-year-old barbara thomas vanished a week ago. according to her husband, she vanished in the mojave desert wearing only a black bikini and a red hat with a beer in hand. he says he stopped to take a picture, and when he looked, she was gone. >> she rounded the corner and i lost sight of her. >> rep...

He and his wife barbara were alone when she disappeared last friday. thomas said he failed a polygraph test. >> police consider me the prime suspect because there was just the two of us. i know that polygraphs aren't 100% and i have not had any sleep. >> thomas says he had nothing to do with her disappearance and that he last saw his wife walking ahead of him as he stopped to take a photo. >> by the time i took the pictures she was continuing on because she wanted to get to the rv and she rounded the corner and i lost sight of her. my feeling is she was picked up. she had to cross a highway. s...

This case, when you look at the gunpowder residue, there was none on bambi. >> he said that one bit of hard evidence detectives thought they had against bambi, what they thought was blood on her boot, turned out to be nothing. >> detectives said, we've got her dna on this boot. it's going to belong to one of the two people. they couldn't even say it was dna. >> as for the polygraph test, detectives said bambi failed to pass, according to irvin, those results were suspicious. >> the last question they asked her, have you told me everything you know about this case? if i ask a detective that sam...